Chapter 66. Database Physical Storage

   Table of Contents

   66.1. Database File Layout
   66.2. TOAST

        66.2.1. Out-of-Line, On-Disk TOAST Storage
        66.2.2. Out-of-Line, In-Memory TOAST Storage

   66.3. Free Space Map
   66.4. Visibility Map
   66.5. The Initialization Fork
   66.6. Database Page Layout

        66.6.1. Table Row Layout

   66.7. Heap-Only Tuples (HOT)

   This chapter provides an overview of the physical storage format used
   by PostgreSQL databases.